Anatomy All are true regarding trachea except: A C shaped cartilages B Outer diameter is 20 mm C More than 20 hyaline cartilages D Isthmus of thyroid gland related at 2, 3, 4th tracheal rings Explanation: 💡 Explanation All are true regarding trachea except: ✓ Correct Answer: C. More than 20 hyaline cartilages